Do we need a warranty card to claim iphone problem?

Hi

You will need to ask Apple or an Apple Authorised Service Provider whether warranty service is available to you in Poland (this is a user-based technical support community - I'm afraid that no-one here can tell you what Apple will decide):

• Kontakt — Oficjalne Wsparcie Apple
• https://twitter.com/applesupport
• Telephone: 00800 4411875

The warranty terms - and instructions for obtaining warranty service - for an iPhone purchased in the UAE from Apple or an Apple Authorised Distributor are available here:

http://www.apple.com/legal/warranty/products/ios-warranty-emea-english.html

Note that:

• Apple may restrict warranty service to the country where Apple or its Authorised Distributor originally sold the device.
• If service under warranty is offered, you may first be required to provide your proof of purchase for the iPhone.

No, you don't ordinarily need any documentation. Note that the warranty is only valid in the country of purchase.

You can check your warranty here:

https://checkcoverage.apple.com